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  <div id="layout-content"><div id="function.gmp-random" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gmp_random</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_random</span> &mdash; <span class="dc-title">Random number</span></p>

 </div>

 <div id="function.gmp-random-refsynopsisdiv">
  <div class="warning"><strong class="warning">警告</strong><p class="simpara">本函数已自 PHP 7.2.0
 起被<em class="emphasis">废弃</em>，并自 PHP 8.0.0 起被<em class="emphasis">移除</em>。
 强烈建议不要依赖本函数。</p></div>
 </div>
 
 <div class="refsect1 description" id="refsect1-function.gmp-random-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gmp_random</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$limiter</code><span class="initializer"> = 20</span></span>): <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>

  <p class="para rdfs-comment">
   Generate a random number. The number will be between 0 and (2 ** n) - 1,
   where n is the number of bits per limb multiplied by <code class="parameter">limiter</code>.
   If <code class="parameter">limiter</code> is negative, negative numbers are generated.
  </p>
  <p class="para">
   A limb is an internal GMP mechanism. The number of bits in a limb is
   not static, and can vary from system to system. Generally, the number
   of bits in a limb is either 32 or 64, but this is not guaranteed.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gmp-random-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">limiter</code></dt>

     <dd>

      <p class="para">
       The limiter.
      </p>
      <p class="para"><span class="classname"><a href="class.gmp.html" class="classname">GMP</a></span> 对象或 <span class="type">int</span> ，或数字<span class="type">string</span>。</p> 
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gmp-random-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A random GMP number.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gmp-random-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3068">
    <p><strong>示例 #1 <span class="function"><strong>gmp_random()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$rand1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_random</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;random&nbsp;number&nbsp;from&nbsp;0&nbsp;to&nbsp;1&nbsp;*&nbsp;bits&nbsp;per&nbsp;limb<br /></span><span style="color: #0000BB">$rand2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_random</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;random&nbsp;number&nbsp;from&nbsp;0&nbsp;to&nbsp;2&nbsp;*&nbsp;bits&nbsp;per&nbsp;limb<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
1915834968
8642564075890328087
</pre></div>
    </div>
   </div>
  </p>
 </div>


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